diff --git a/ruby.spec b/ruby.spec
index cf54c79..c90a20c 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -22,7 +22,7 @@
 %endif
 
 
-%global release 142
+%global release 143
 %{!?release_string:%define release_string %{?development_release:0.}%{release}%{?development_release:.%{development_release}}%{?dist}}
 
 # The RubyGems library has to stay out of Ruby directory tree, since the
@@ -892,6 +892,18 @@ MSPECOPTS=""
 # Avoid `hostname' dependency.
 %{!?with_hostname:MSPECOPTS="-P 'Socket.gethostname returns the host name'"}
 
+# Provide workaround for s390x zlib errors in tests on RHEL 8.
+# The library works, but there seems to be chip acceleration used
+# resulting in failing asserts against hardcoded values that were
+# created for a different algorithm than is the default on that platform.
+# Fix taken from:
+# https://github.com/ruby/zlib/commit/280a1b5905d752af25e9f09e6511388cb4260eb2
+%ifarch s390x
+  # Force chip acceleration off.
+  # https://www.ibm.com/docs/en/linux-on-systems?topic=o-applications-2
+  export DFLTCC=0
+%endif
+
 # Some infra allows DNS resolution but then does not allow
 # connection to proceed, let's ignore it altogether for now.
 # Our expectation is that there is no network connectivity outside
@@ -1376,6 +1388,10 @@ DISABLE_TESTS="$DISABLE_TESTS -n !/TestBundledCA/"
 
 
 %changelog
+* Tue May 21 2024 Vít Ondruch <vondruch@redhat.com> - 3.0.7-143
+- Fix Zlib test failures on s390x due to HW acceleration
+  Related: RHEL-36189
+
 * Mon May 13 2024 Jun Aruga <jaruga@redhat.com> - 3.0.7-142
 - Upgrade to Ruby 3.0.7.
   Resolves: RHEL-36189